Truncate long texts + config option

demo/simple_test.py

@@ -18,10 +18,12 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
 import time
-
+import sys
+from math import cos, sin
+from subprocess import call
 from pygal import *
 from pygal.style import *
-from math import cos, sin
+
 lnk = lambda v, l=None: {'value': v, 'xlink': 'javascript:alert("Test %s")' % v, 'label': l}
 
 t_start  = time.time()
@@ -151,12 +153,13 @@ line.interpolation_precision = 200
 line.render_to_file('out-line.svg')
 
 stackedline = StackedLine(fill=True)
-stackedline.add('test1', [1, 3, 2, None, 2, 13, 2, 5, 8])
+stackedline.add('test1u euirset uriets ur itseruie uriset uriest u', [1, 3, 2, None, 2, 13, 2, 5, 8])
 stackedline.add('test2', [4, 1, 1,  3, 12,  3])
 stackedline.add('test3', [9, 3, 2, lnk(10, '!'),  8,  2])
-stackedline.x_labels = ['a', 'b', 'c', 'd', 'e', 'f', 'g']
-stackedline.title = "Stackedline test"
-# stackedline.interpolate = "cubic"
+stackedline.x_labels = ['aaisaruistarsitauritaria', 'bsruie trstie rusiet ruetsru', 'cuasitaruisrnauciuestuirue uiretsu iersut irasui', 'd', 'e', 'f', 'g']
+stackedline.title = "Stackedline ine uisernuis enuir esnue sunres nuise nuires uinsre auin ruist arusit arst ierustie ruiset uriest uirest test"
+# stackedline.interpolate = "cubic"xb
+
 stackedline.render_to_file('out-stackedline.svg')
 
 xy = XY(Config(fill=True, style=NeonStyle, interpolate='cubic'))
@@ -201,4 +204,10 @@ radar.title = "Radar test"
 
 radar.render_to_file('out-radar.svg')
 
+call(['wsreload', '--url', "file:///*/*/kozea/pygal/*"])
+
 print "Ok (%dms)" % (1000 * (time.time() - t_start))
+
+if '-t' in sys.argv:
+    import pytest
+    pytest.main('')

pygal/config.py

@@ -104,6 +104,10 @@ class Config(object):
     disable_xml_declaration = False
     #: Write width and height attributes
     explicit_size = False
+    #: Legend string length truncation threshold
+    truncate_legend = 15
+    #: Label string length truncation threshold (None = auto)
+    truncate_label = None
 
     def __init__(self, **kwargs):
         """Can be instanciated with config kwargs"""

pygal/graph/base.py

@@ -23,9 +23,10 @@ Base for pygal charts
 
 from __future__ import division
 import io
-from pygal.serie import Serie, Value, PositiveValue
+from pygal.serie import Serie, Value
 from pygal.view import Margin, Box
-from pygal.util import get_text_box, get_texts_box, cut, rad, humanize
+from pygal.util import (
+    get_text_box, get_texts_box, cut, rad, humanize, truncate)
 from pygal.svg import Svg
 from pygal.config import Config
 from pygal.util import cached_property
@@ -85,7 +86,9 @@ class BaseGraph(object):
         """Compute graph margins from set texts"""
         if self.show_legend:
             h, w = get_texts_box(
-                cut(self.series, 'title'), self.legend_font_size)
+                map(lambda x: truncate(x, self.truncate_legend),
+                  cut(self.series, 'title')),
+                self.legend_font_size)
             self.margin.right += 10 + w + self.legend_box_size
 
         if self.title:

pygal/graph/graph.py

@@ -25,7 +25,7 @@ from __future__ import division
 from pygal.interpolate import interpolation
 from pygal.graph.base import BaseGraph
 from pygal.view import View, LogView
-from pygal.util import is_major
+from pygal.util import is_major, truncate, reverse_text_len
 from math import isnan, pi
 
 
@@ -104,6 +104,18 @@ class Graph(BaseGraph):
             return
 
         axis = self.svg.node(self.nodes['plot'], class_="axis x")
+        truncation = self.truncate_label
+        if not truncation:
+            if self.x_label_rotation:
+                truncation = 25
+            else:
+                first_label_position = self.view.x(self._x_labels[0][1])
+                last_label_position = self.view.x(self._x_labels[-1][1])
+                available_space = (
+                    last_label_position - first_label_position) / (
+                        len(self._x_labels) - 1)
+                truncation = int(
+                    reverse_text_len(available_space, self.label_font_size))
 
         if 0 not in [label[1] for label in self._x_labels] and draw_axes:
             self.svg.node(axis, 'path',
@@ -123,7 +135,9 @@ class Graph(BaseGraph):
                              x=x,
                              y=y + .5 * self.label_font_size + 5
             )
-            text.text = label
+            text.text = truncate(label, truncation)
+            if text.text != label:
+                self.svg.node(guides, 'title').text = label
             if self.x_label_rotation:
                 text.attrib['transform'] = "rotate(%d %f %f)" % (
                     self.x_label_rotation, x, y)
@@ -183,7 +197,8 @@ class Graph(BaseGraph):
                 width=self.legend_box_size,
                 height=self.legend_box_size,
                 class_="color-%d reactive" % i
-            ).text = title
+            )
+            truncated = truncate(title, self.truncate_legend)
             # Serious magical numbers here
             self.svg.node(
                 legend, 'text',
@@ -191,7 +206,9 @@ class Graph(BaseGraph):
                 y=1.5 * i * self.legend_box_size
                 + .5 * self.legend_box_size
                 + .3 * self.legend_font_size
-            ).text = title
+            ).text = truncated
+            if truncated != title:
+                self.svg.node(legend, 'title').text = title
 
     def _title(self):
         """Make the title"""
@@ -199,7 +216,8 @@ class Graph(BaseGraph):
             self.svg.node(self.nodes['graph'], 'text', class_='title',
                       x=self.margin.left + self.view.width / 2,
                       y=self.title_font_size + 10
-            ).text = self.title
+            ).text = truncate(self.title, int(reverse_text_len(
+                self.width, self.title_font_size)))
 
     def _serie(self, serie):
         """Make serie node"""

pygal/test/test_util.py

@@ -18,7 +18,7 @@
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
 from pygal.util import (
     round_to_int, round_to_float, _swap_curly, template, humanize,
-    is_major)
+    is_major, truncate)
 from pytest import raises
 
 
@@ -111,3 +111,13 @@ def test_is_major():
         assert is_major(n)
     for n in (2, 10002., 100000.0003, -200, -0.0005):
         assert not is_major(n)
+
+
+def test_truncate():
+    assert truncate('1234567890', 50) == '1234567890'
+    assert truncate('1234567890', 5) == u'1234…'
+    assert truncate('1234567890', 1) == u'…'
+    assert truncate('1234567890', 9) == u'12345678…'
+    assert truncate('1234567890', 10) == '1234567890'
+    assert truncate('1234567890', 0) == '1234567890'
+    assert truncate('1234567890', -1) == '1234567890'

pygal/util.py

@@ -175,9 +175,14 @@ def compute_scale(min_, max_, logarithmic=False, min_scale=4, max_scale=20):
     return positions
 
 
-def text_len(lenght, fs):
+def text_len(length, fs):
+    """Approximation of text width"""
+    return length * 0.6 * fs
+
+
+def reverse_text_len(width, fs):
     """Approximation of text length"""
-    return lenght * 0.6 * fs
+    return width / (0.6 * fs)
 
 
 def get_text_box(text, fs):
@@ -217,6 +222,13 @@ def cycle_fill(short_list, max_len):
     return short_list
 
 
+def truncate(string, index):
+    """Truncate a string at index and add ..."""
+    if len(string) > index and index > 0:
+        string = string[:index - 1] + u'…'
+    return string
+
+
 # Stolen from brownie http://packages.python.org/Brownie/
 class cached_property(object):
     """Optimize a static property"""